Dela Rosa said the victims are now safe and already went home after they had their checkup at the hospital.

The alarmed city mayor arrived in the city via Philippine Airlines at 4 a.m. straight from Korea and called for command conference which was attended by the DCPO, Task Force Davao, Police Regional Office (PRO) 11, and Army's 10th Infantry Division, among others.

Duterte, in a command conference at the Grand Men Seng Hotel, said the city has been receiving threats for the past few months this year. He added that they are now trying to look into the probable cause of the two bomb blast.

Duterte said they are looking at whether the incident is connected to political aspiration, or rebellion, or interest, revenge and hatred. He added that as of now he could not give exact details on who was responsible for the attack.

"There's a threat and we will take it seriously even if there's no casualty in the incident. We will minimize the effects of the blasts because it appears to be a statement, may gustong ipahiwatig ang gumawa nun," Duterte said.

When asked if the Moro National Liberation Front (MNLF) has something to do with the incident, Duterte said in a scale of 1 to 10, he would rate it 1. He added that he had earlier talked to MNLF chair Nur Misuari and the latter said it was not the handiwork of his group.

Davao MNLF chair Rolando T. Olamit, in a separate interview, also denied the MNLF as behind the bomb blasts, adding that it might be a "third force" who is behind the incident.

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